Monitor should require the setup of `pserv` and maybe `twinkles`

Currently, essential functionality of the `monitor` depends on `pserv` functionality. However, it does not setup `pserv` automatically when it is setup. This should be modified by adding
```
setupRequired(pserv)
``` 
to
https://github.com/LSSTDESC/Monitor/blob/master/ups/Monitor.table